1. May be the fault of the impeller :
If in the working process of impeller gear attached to the great obstacles. It must be caused by suction corresponding increase a lot, so is not a big problem, but in the clean-up the above obstacles must be careful, this blockage is in general not easy cleaning, when after the completion of clean-up and coated with a layer of anti rust oil, so you can as far as possible to avoid being blocked this obstacle.
2. May be air or inlet pipeline leakage occurred :
The probability is relatively high, because in the use of the process if the air does not reach the degree of sealing, then it will corresponding caused suction lift too high. When this happens to carefully check exactly in which caused the leakage of air. Sometimes you can consult the fire pump manufacturers.
3. May be stuffing inside the filler material leakage or die wear :
This situation appears to be relatively small, because under normal circumstances in the stuffing inside the device is not easy to be damaged. If after inspection is the case, then the inside of the filler to clean up the replacement of the new. Otherwise, it is not easy to deal with the problem completely.
